The Ravens have been centered around the run for a few years. It was ok when the defense was very good. It does not work when your defense is a sieve. I am not sure where this offense centered around Flacco ro Rice. The offense struggles just as much when they go run heavy because it is predictable. If you look at the long stretches of offensive futility there will be a lot of runs for little or no gain.
The issue with the Ravens offense is not a Flacco or Rice issue. It is a scheme and creativity issue. The Ravens are not a power running team. They just can't run over teams. Rice and Flacco perform best out of the single back. That is what they used to torch a very good Cincy defense. Problem is that as soon as they run into any issues they Harbaugh goes ultra conservative.